/*
 * Copyright 2010 Chad Retz
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.jdocng.util;

import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Utilities to assist in handling files
 *
 * @author Chad Retz
 */
public class FileUtils {

    /**
     * Recursively get all files from a directory
     * 
     * @param directory
     * @param filter
     * @return
     */
    public static List<File> getFiles(File directory, FileFilter filter) {
        if (!directory.exists() || !directory.isDirectory()) {
            return Collections.emptyList();
        }
        List<File> files = new ArrayList<File>();
        for (File file : directory.listFiles(filter)) {
            if (file.isDirectory()) {
                files.addAll(getFiles(file, filter));
            } else if (file.isFile()) {
                files.add(file);
            }
        }
        return files;
    }
}
